package string;

public class StringAndStringBuilderDemo {
    public static void main(String[] args) {
        //String性能测试
        /*
        String str = "a";
        for (int i=0;i<1000000;i++){
            str += "a";
        }
        System.out.println("执行完毕");

         */
        StringBuilder builder = new StringBuilder("a");
        for (int i=0;i<1000000;i++){
            builder.append("a");
        }
        System.out.println("执行完毕");
    }
}
